AL-KO BKS 4540 Traduction Du Mode D'emploi Original page 45

Maintenance of Saw Chain and Guide Bar
Place your file on the cutter and push straight forward.
Keep the file position as illustrated.
After every cutter has been set, check the depth gauge and file it to the proper level as illustrated.
WARNING!
Be sure to round off the front edge to reduce the chance of kickback or tie-strap breakage.
Make sure every cutter has the same length and edge angles as illustrated.
File diameter
Type of chain
21BPX
Depth gauge
447 077_b
Top plate angle
Vise ro-
tate angle
3/16" 30°
Head tilt
Down angle
angle (55°)
Vise tilt angle Side angle
10°
Depth gauge
standard
85° 0.025"
File
45